Re: [Help-smalltalk] Re: Using Smalltalk as a scripting language

[Roland Plüss]

>> Something I didn't understand on the way you manipulate ST data from C?
>
> You forgot the instance variables defined by superclasses of "DEEngine
> class".  Better initialize uniqueInstance lazily:
>
>     DEEngine class [
>         | uniqueInstance |
>         uniqueInstance [ ^uniqueInstance ifNil: [self new] ]
>         new [ <cCall: 'DEEngine.new' returning: #smalltalk args: #() ]
>     ]
>
> ...
>
>     // in the creation function
>     OOP oopClass = gst_class_name_to_oop( "DEEngine" );
>     deEngine::m_stUniqueInstance = pST->CreateNewObject( oopClass );
>     gst_register_oop (deEngine::m_stUniqueInstance);
>
> ...
>
>     static OOP deEngine::stNew ()
>     {
>       return deEngine::m_stUniqueInstance;
>     }
>
> ...
>
>     gst_define_cfunc ("DEEngine.new", deEngine::stNew);
>
> Nice to see some code in this thread!
>
Nice try but this won't work. I have an engine pointer and therefore can
not use a singleton in c++ ( although in smalltalk it becomes one ).
Hence I am forced to work without any static class members there. The
only chance I have to get this working is to somehow inject the created
object into the class side variable. This would by itself work if the
oop I assign would actually show up in smalltalk. I don't know yet why
it stays nil. Did I obtain the wrong c pointer? Did I declare the class
side variable incorrectly?

-- 
Yours sincerely
Plüss Roland

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